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November 8, 2012

Mtg: Bugs and Stadia: Magnetic Reversal At Almost The Nanoscale

by @ 8:28 pm. Filed under ALL, NanoEngineering, Optics/Displays, Semiconductors
 

THURSDAY November 29, 2012
SCV Magnetics Chapter
Speaker: Prof. E. Dan Dahlberg, University of Minnesota
Time: Networking and pizza at 7:00 PM; Presentation at 7:30 PM
Cost: none
Place: Western Digital, 1710 Automation Parkway, San Jose
RSVP: not required
Web: ewh.ieee.org/r6/scv/mag

One of the current frontiers in magnetism is to understand the domain structure and the magnetization reversal in nanometer sized particles.? Explorations at these length scales have been aided by the development of new magnetic imaging techniques, one of which is the magnetic force microscope (MFM), a variant of the atomic force microscope. We have utilized the high resolution MFM (30 nm) we developed to increase our fundamental understanding of magnetism on this length scale.
We will discuss the magnetic reversal of chains of 50nm magnetite crystals (a magnetosome) grown in magnetotactic bacteria (this includes a video of the bacteria trying to find food at the end of the magnetic rainbow).? I will also preview some of our most recent work on the field induced magnetic reversal in stadia shaped particles on the order of hundreds of nanometers wide and about twice that in length.? In general for the small aspect ratio stadia (length to width ratio) the magnetization reverses by the formation of a single vortex and its propagation down the length of a stadium (when the fields are applied erpendicular to the long axis).? The surprising discovery is the importance of virtual particles (vortex- antivortex pairs) creation and annihilation in the magnetic reversal in larger aspect ratio stadia.

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